mitt romney was spotted tacking a break at a denver chipotle with his debate partner senator rob portman. this picture has been a hit on political blogs as part of a caption contest. as for the president, he is near las vegas today for his rehearsals with senator john kerry and was caught joking about them. >> basically they're keeping me indoors all the time. it's a drag. [ laughter ] >> they're making me do my homework. >> reporter: while both the president and romney appeared relaxed, there is a lot at stake for their first head-to-head battle. >> in any good debate, you want to have some things prepared in advance. you want to have memorable lines, surprise your opponent and knock them off their feet, and you want to be remembered for something. >> reporter: the "new york times" reports that the romney camp has prepared him with a series of, quote, zingers he can use tomorrow night. romney will likely be walking a fine line while the president will have to avoid appearing smug or condescending. >> mitt romney really has to take on the president forcefully but realistically if he want